25525070521 has 4 divisors (see below), whose sum is σ = 25539245044. Its totient is φ = 25510896000.

The previous prime is 25525070503. The next prime is 25525070569. The reversal of 25525070521 is 12507052552.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3364580025 + 22160490496 = 58005^2 + 148864^2 .

It is a cyclic number.

It is not a de Polignac number, because 25525070521 - 2¹¹ = 25525068473 is a prime.

It is a super-2 number, since 2×25525070521² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25525070581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7084560 + ... + 7088161.

It is an arithmetic number, because the mean of its divisors is an integer number (6384811261).

Almost surely, 2^25525070521 is an apocalyptic number.

It is an amenable number.

25525070521 is a deficient number, since it is larger than the sum of its proper divisors (14174523).

25525070521 is a wasteful number, since it uses less digits than its factorization.

25525070521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14174522.

The product of its (nonzero) digits is 35000, while the sum is 34.

The spelling of 25525070521 in words is "twenty-five billion, five hundred twenty-five million, seventy thousand, five hundred twenty-one".